B.F.
I have the newest diswasher, and a really good one as well, yet i've had the same problems. I think it's due to the water you have. If it's well water it may leave more of a residue? But i find i have to rinse out cups and things as well. Baby bottles i always washed by hand until my daughters were about 1 year. There are lots of new detergents out there, but do what you feel right about doing. I still rinse(along with using a rinse aid, and cascade complete).